Make skia::GetNativeDrawingContext Windows-only

skia/ext/platform_canvas.cc

Index: skia/ext/platform_canvas.cc
diff --git a/skia/ext/platform_canvas.cc b/skia/ext/platform_canvas.cc
index eb954969eb09315f181dcff5f30e7a37d995bab4..81f8ff584128b37cba10e57cfa20b9a74049675b 100644
--- a/skia/ext/platform_canvas.cc
+++ b/skia/ext/platform_canvas.cc
@@ -86,17 +86,4 @@ bool IsPreviewMetafile(const SkCanvas& canvas) {
 }
 #endif
 
-NativeDrawingContext GetNativeDrawingContext(SkCanvas* canvas) {
-  PlatformDevice* platform_device = GetPlatformDevice(canvas->getTopDevice(true));
-  if (!platform_device)
-    return nullptr;
-
-  // Compensate for drawing to a layer rather than the entire canvas
-  SkMatrix ctm;
-  SkIRect clip_bounds;
-  canvas->temporary_internal_describeTopLayer(&ctm, &clip_bounds);
-
-  return platform_device->BeginPlatformPaint(ctm, clip_bounds);
-}
-
 }  // namespace skia